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From: John Baldwin <jhb@freebsd.org>
To: John Birrell <jb@what-creek.com>
Date: Thu, 15 Jun 2006 14:33:24 -0400
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Cc: perforce@freebsd.org
Subject: Re: PERFORCE change 99099 for review
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On Wednesday 14 June 2006 16:52, John Birrell wrote:
> On Tue, Jun 13, 2006 at 09:30:46AM -0400, John Baldwin wrote:
> > On Monday 12 June 2006 20:47, John Birrell wrote:
> > > http://perforce.freebsd.org/chv.cgi?CH=99099
> > > 
> > > Change 99099 by jb@jb_freebsd2 on 2006/06/13 00:47:28
> > > 
> > > 	Add hooks for DTrace to register a function to be called when
> > > 	the scheduler chooses a new thread to run. This is required for
> > > 	DTrace vtime.
> > 
> > You should probably do this in mi_switch() in kern_synch.c rather than
> > in this macro.
> 
> Looking further at this is seems that the code actually has to be
> inserted into each scheduler just before the call to cpu_switch because
> the schedulers are each capable of selecting a new thread right up
> to that time (see sched_switch).

Ah, yes, I didn't realize at first you needed to know what the new thread is.

-- 
John Baldwin